A semi gantry crane is a gantry crane with one leg running along a ground track while the other end of the bridge is supported by a truck running along an overhead track.

Semi gantry cranes, with their unique structure and practicality, have become an indispensable member of modern industry. It is particularly suitable for light and medium-duty lifting tasks, such as cargo loading and unloading, machine equipment maintenance, various applications in docks and factories, etc.

Portalni žerjav z enim nosilcem je v glavnem sestavljen iz mostu (glavni nosilec), štirih opornikov, spodnjega nosilca, pogonske naprave za voziček, električnega krmiljenja, električnega dvigala itd. Mostni okvir (glavni nosilec) portalnega žerjava z enim žarkom je na splošno škatlasto strukturo, zvarjeno z jeklenimi ploščami. Dno glavnega nosilca je opremljeno s tirnico I-nosilca za delovanje električnega dvigala. Lahko se uporablja tudi za glavni nosilec portalnih žerjavov z velikim razponom, ki delajo na prostem. Nosilna konstrukcija, oblikovana z varjenjem profilnega jekla, ima visoko togost (zlasti vodoravno togost), majhno težo, majhno privetrno območje in ima velike gospodarske koristi. Vendar je izdelava in varjenje te konstrukcije bolj zapletena in težavna od škatlaste strukture.

Semi-gantry crane is suitable for lifting, transporting, loading and unloading in open-air working places such as stations, docks, warehouses, construction sites, cement product yards, machinery or structural assembly yards, power stations, etc. It is also suitable for working in indoor workshops.

The jib of a crane is an extension or an arm that protrudes from the main body of the crane. It is an important component that enhances the crane's reach and lifting capabilities.

Jib cranes, also known as swing cranes, are versatile lifting devices widely used in various industries.